Send messages and snapshots to matrix rooms.
Install via the bundled Plugin Manager or manually using this URL:
https://github.com/Cadair/octoprint-matrix-notifier-plugin/archive/main.zip
The plugin can be configured via the octoprint UI. You will need the room alias or room id of the matrix room as well as your server address and an access token.
The easiest way to obtain an access token is to login with Element, copy the access token from the settings panel and then do not logout.
This plugin is heavily inspired by OctoSlack and I used Octoprint Signal Notifier to understand how to write an octoprint plugin and how to capture a snapshot from the camera.